The thermal effort during marine steam turbine flooding with water

Abstract

The work discussed an extreme case of cooling a steam turbine. The ship’s steam turbine was used as an example. In marine transport units with low-speed engines dominate, however, there are also units with steam turbines. An example of analysed marine steam turbine is shown in Fig. 1. When considering the issue of cooling steam turbines, it is necessary to estimate the extreme conditions that may occur during operation of the turbine. For this reason, the paper presents the results of the Thermal-FSI analysis of flooding a marine steam turbine with water. The temperature distributions and the corresponding stress fields were determined, which provided information on the effects of flooding the steam turbine with water. New technologies and theoretical examples force a new approach to considered complex flow-strength issues. One of the solutions are calculations that combine liquid and solid, so-called Thermal-FSI (Thermal Fluid-Structure-Interaction). During flow calculations, individual calculated time sub-periods are exported to a solid state solver. Then the problem of the solid body is solved, which results in stresses and deformations. Deformations of geometry result in the subsequent digitization of the geometry. The new grid is passed to the fluid solver in which the next time-stepping is calculated. The operation sequence is repeated until the end of the calculation time.